CVE-2021-1619 Cisco IOS XE Software NETCONF and RESTCONF Authentication Bypass Vulnerability
Unauthenticated remote attackers can bypass NETCONF/RESTCONF authentication to modify device configurations or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-1619?
CVE-2021-1619 is a critical authentication bypass vulnerability in Cisco Ios Xe, published on 23 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the authentication, authorization, and accounting (AAA) function of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass NETCONF or RESTCONF authentication and do either of the following: Install, manipulate, or delete the configuration of an affected device Cause memory corruption that results in a denial of service (DoS) on an affected device This vulnerability is due to an uninitialized variable. An attacker could exploit this vulnerability by sending a series of NETCONF or RESTCONF requests to an affected device. A successful exploit could allow the attacker to use NETCONF or RESTCONF to install, manipulate, or delete the configuration of a network device or to corrupt memory on the device, resulting a DoS.
Which versions are affected by CVE-2021-1619?
It affects 146 products.
Products include Cisco Ios Xe, Cisco Ios Xe Sd-Wan, Cisco Ios Xe Sd-Wan 16.10.1 When Installed on 1000 Series Integrated Services, Cisco Ios Xe Sd-Wan 16.10.1 When Installed on 4000 Series Integrated Services, Cisco Ios Xe Sd-Wan 16.10.1 When Installed on Asr 1000 Series Aggregation Services, Cisco Ios Xe Sd-Wan 16.10.1 When Installed on Integrated Services Virtual and 140 more.
How do I fix CVE-2021-1619?
No fix has been published for CVE-2021-1619 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-1619 being exploited?
There is no known exploitation of CVE-2021-1619 in the wild and no public exploit code.
Other vulnerabilities in Cisco Ios Xe
- CVE-2023-20198 Cisco IOS XE Web UI Privilege Escalation
- CVE-2018-0151 Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution
- CVE-2023-20273 Cisco IOS XE Web UI Command Injection
- CVE-2025-20188 Hardcoded credentials in Cisco IOS XE Software
- CVE-2021-34770 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability
Sources
Also known as GHSA-q3g7-fff3-j4mq.